Harrow



April 8, 1930. J. M. HJERMSTAD 1,754,103

i HARRow Filed April 30, 1928 5 Sheets-Sheet l NN km .wm

HARROW Filed April 30, 1928 3 Sheets-Sheet 2 QN kmb Nm. Qw NW QQ. NWN no NAM o. o o w l y O f 0 QQ www .5 K www Y @NNI l/ w .NW KR W. ,X Wk n.1 @W mum... D@ own L@ 1 l D J ll 'lllllllllll s E .N .9N S w u@ A mkfmxw N T f mk l N m Sm April 8, 1930- J. M, HJERMSTAD 1,754,103

HARROW Filed April 30, 1928 5 Sheets-Sheet 3 wnNEssEs Y INVENTOR f 10a.Z/'/'HZS 616/ M7/2f i 105 YW,

5 ATTORNEYS Patented Apr. 8 193() oFFlcE JOI-IN M. I-IJERMSTAD, OF REDWING, MINNESOTA Application filed April 30,

This invention relates to harrows tor re- HARROW moving` the roots ofWeeds from the soil.

An object oi the invention is ti e pro fision ot a device for removingroots of plants trom 5 the soil, by means of a plurality of teethcarried in an operativefposition along a hori zontal path throughchains, said chains and teeth being retained stationary at Will or thespeed ot movement ot the teeth being retarded.

A further object of the invention is the provision of a harrovvincluding a plurality ot chains operated by the usual traction Wheels ofthe harroivs and carrying ground engaging teeth moved through ahorizontal plane when operatively positioned, the chains and teeth beingsupported by a trame `which `may be elevated at will in an inoperativelposition when the barrow is being transported.

A further objectof the invention is the Aprovision oa barrow including aplurality oitl chains operated by the usual traction Wheels of theharrovvs and carrying ground engaging teeth moved through. a horizontalplane when operatively positioned, a brak ing means being incorporatedin the driving mechanism tor the chains for retarding the speed oimovement of said chains or for retarding the speed, provision beingfurther lmade for disconnecting the chains from operative engagementwith the traction Wheels when the harroufis reversed from a foi-Ward toa backward movement.

disclosure being susceptible of suchchanges Jand modifications as shalldei-ine 11o-material.

departure from the salient features ot the in vention as expressedinatheappended claims.

of a harrovv con- 1928. serial No. 274,146.

structed according to the principles of my invention,

Figure 2 is a longitudinal side view showing the ground engaging teethin an inoperative position, 50

Figure 3 is a longitudinal vertical section 'taken along the line 3-3 ofFig. 1.-

Figure at is a fragmentary vertical section through the operating shaftJfor driving the ground engaging teeth,

Figure 5 is a vertical section taken along the line 5--5 of Fig. 1,

Figure 6 is a fragmentary plan vievv of a brake mechanism,

Figure 7 is a transverse vertical section taken along the line 7-7 otFig. 1,

Figure 8 is a vertical section taken along the line 8 8 of Fig. 7.

Referring more particularly to the drawings .10 designates a frame ordrag which is 65 substantially rectangular in cross section andconstitutes the supports for the various devices vvhich are coordinatedto remove the roots of Weeds from the soil. The frame in turn issupported in spaced relation With the ground by a rear Wheel 11 andfrontWheels V12 mounted on an axle 13 adjacent the ends thereof.

The rear end of said frame at the middle lportion is provided with ahearing 1-1 in 7 Which is mounted an axle 15. A fork 16 formed of arms17 and 18 carries an axle 19 on which is mounted the hub of the rearWheel 11. The arms 17 and 18 located upon opposite sides of the Wheel 11at the fork have bear- 80 ings 2O and 21 received by the axle 15. A

collar 22 is connected by rods 23 to the upper portion 24 of frame hars25 aids in retaining 4the axle in the vertical. The forward ends of theside hars 26 are 85 lpro-vided with bearings 27 which receive andsupport the axle 13. The forward ends of 'the` iframel bars 25havebearings 28`vvhich .receivesaid axle. 1

CII

mediate portion f the axle and extends forwardly and along thelongitudinal axis of the frame 10. Links 32 have pivotal connectionswith perforated ears 33 and are fastened at 34 to the tongue 30.

A scat 35 is secured to a transverse bar 36 'which in turn is rigidlyconnected at its ends to the upper portion 24 of the frame hars 25 andat points on said bars where they are hent downwardly at an angletowards the front aXle.

A shaft 40 'has its opposite end -carried in hearings 41 on the rearends of angle irons 42. A plurality of sprockets 43 are rigidly securedto the shaft in spaced relation. A secondy shaft 44 is mounted inrbearings 45at the other or forward ends of the angle irons 421.Sprockets 46 are secured to the shaft 44 and alined with similarlyplaced sprockets on the shaft 40. The side bars 26 adjacent the shaft 46have an arcuately shaped portion 47 to permit upward movement of theshaft as will be presentlyexplained.

A plurality of chains 50 are located in 1 Vspaced relationlongitudinally of the frame l0 and are trained on pairs of the alinedsprockets 43 and 46. Bars 51 are connected in spaced relation on thechains and are Ydisposed transversely of the frame and withintheconfines thereof. vGrround engagingteeth are connected to the bars 51in an'outwardly projecting relation with the chains. Arms 53 are securedto the ends of the bars 51 and have their free ends extending upwardlytowards the shafts 40 and 44. These arms are inclined at an angle 'tothe vertical and are provided with rollers 54 at the free ends thereofadapted to engage `a 'flange of the angle iron bars 42 when the teeth 52are in engagement with the `ground whereby. said teeth are properlysupported when removing roots of weeds or other undesirable plants fromthe ground.

The sprockets 43 and 46, together` with their chains 50 and angle ironIbars 42kare movable vertically as a unit so that the teeth 52 may belifted from the ground when the dragis being conveyed to and from'afield. `A pair of V-shaped brackets are located adjacent the side bars26 and have their lower ends connected to the angle bars 42 and I61. Alink 62 is pivotally connected to the upper end of each bracket 60L andalso to a lever "63. The lever is rigid with a sha-ft '64 'which ismoun'tedvin bearings 65 formed at the upper ends ofVlshap'ed standardsvsecured'at 'their lower ends to the sidefbars "26. i

The manually operable lever is loosely mountedonv the shaft l64 vand inclose association with the curvedr'ack 472 which is rigid withfthe-sliaft-SL A hand lever '7 5 is pivota'lly mountedon the free end ofthe lever 70 and a link 74 connects the hand or lever 7 5 'Withja paw'l7lV slidabl mounted'inagui-de 'toengage the teeth of the rack? 2, and aspring 7l maintains the pawl in position to always engage the teeth. Thelink 62 is bent at V62a to provide an angular portion which is adaptedto engage over the shaft 64 as will be presently explained.

A pawl 76 pivotally mounted on the bar 24 is connected by a link 77 to alever or foot treadle 78 pivoted at 79 to a side bar 26. The pawl has aweight 8O for maintaining the pawl in engagement with the teeth of therack 72. lVhen the treadle is depressed the p'awl vis released from therack to vpermit actuation of the shaft64`for elevating 'or lowering ofthe bars 42 carrying the harrowing unit.

A brake drum '90 is keyed at 91 to the shaft 44 :and aV brake bandv92 istrained around the periphery of said drum. An end 93 of the band isconnecteda-t 94 to one end of a lever 95 pivoted at 96 to a link 97. Oneend of the link is pivoted on the axle 13 while theother end is pivotedvon an outer end `of the shaft 44. A link 98 is pivoted at one end on'the pin 96 and has theV other end connected at 99 to the otherend ofthestrap 92.

A lever 100 is secured at 10v1'to the shaft 102 mounted inhearings inthelinks 97 and is movable with the links. The hub 103 of each tractionwheel 12 has laterally projecting pins 104 upon each of which ispivotally mounted a pawl or dog 105 adapted to'engage the teeth 106 of asprocket 107 loose on the axle y13. A chain 108 is trained over thesprocket 107 and a sprocket 109 rigid with the shaft 44.

It will be noted that the brake drums 90, sprockets 107 and 109 and therelated parts are duplicated upon opposite sides of the frame. A foottreadle 110 is rigidly connected to the shaft 102 s0 that when saidtreadle is operated and moved forwardly the lever 100 will actuate thelever 95 for tightening the brake band on the drum.

The operation of my device is as follows:

, The drag is drawn by the tongue 30V while the cultivating unit ismaintained in an elevated position, as-shown in Fig. 2, b. means of thepawl 76 and the rack V72. l hen the place has been reached where it isdesired to y"cultivate the soil or remove roots from the ground, thefoot pedal 78 is actuated to release the 'pawl 76. The lever 70 is heldrigidly by the hand of the operator and is gradually loweredperi'nitting the cultivating unit to be lowered. W'hen the lever 470 hasreached its lower `limit of movement, the foot pedal 78 isrelea'sedwhereby the pawl'? 6 will move into 'engagement with the 'rack 7 2 andY:hold 'the cultivating unit against further downward movement. The handgrip or iever't' is then actuated' releasing ,the pawi 71 whence saidlever isinoved upwardly and the hand grip is then 'released to 'permit"the pvi 71 to "engage the teeth of the Vrack 72. e ffo'ot pedalmanually permitting the cultivating unit to be further lowered. Theseoperations are repeated until the teeth are properly engaged in theground.

As soon as the teeth are engaged in the ground there will be a tendencyto move the chain 50 in the direction indicated by the arrow in Fig. 3.The dogs 105 shown in Fig. 8 will engage theteeth 107 ot the sprocket106 and thereby connect with the traction wheel 12 ot' the sprocket torcausing rotation ot the sprockets 46 and 43, and likewise the movementot the chains in the direction indi* cated. However, due to thedifference in diameters between the wheel 12 and the sprocket 107 therewill be an apparent slippage of motion between the rearward movement oithe chain and the forward movenient of the vehicle, so that as thevehicle moves forwardly approximately two feet, the

teeth will move rearwardly approximately one foot. that the amount otrearward movement oi the teeth 52 as compared to the forward movementwill be in direct proportion to the diameters of the sprocket 107 andthe wheel 12.

When the device is adapted to be used as a cultivator whereby the teeth52 are maintainedl stationary and drawn through the ground, the tootpedal 110 is depressed causing the brake band 92 to grip the drum 90 andprevent rotation ot the shaft 44. This will maintain the sprockets 46and 43 against rotation while the wheel 12 revolves and the dogs 105slide over the teeth 107 of the sprocket 106. lVhen it is desired toraise the cultivating unit out of the ground, the hand grip 75 willrelease the spring 71a forcing the pawl 71 into engagement with thevteeth ot the rack 72. The lever is then moved upwardly causing rotationof the rack 72 and shaft 64. The lever 63 is then elevated, elevatingthe link 62 and the cultivating unit, after the pawl 76 has beenreleased iirom the rack. As soon as the lever 70 has been elevated to asuiiicient distance, the toot pedal 78 is released permitting the pawl76 to engage the teeth ot the rack 72 and the hand grip is actuated torelease the pawl 71. The lever is then lowered until it reaches a pointadjacent the pivotal connection ot the pawl 7 6. By releasing the handgrip 75 the pawl T1 engages the teeth of the rack and the lever mayagain be elevated for raising the cultivating unit. These operations arerepeated a number of times until the cultivating unit has been raised asuiticientdistance from the ground. When the unit is in its mostelevated position, the angular portion 62'al of the link 62 has engagedover the shaft 64 for aiding in supporting the unit in its elevatedposition.

1t will be noted from an inspection of Figs. 2 and 3of the drawingsthaty the angle iron It will be appreciated, however,

bars 42 are carried by the V-shaped members 60 which in turn areswingably supported from the link 62 carried at the free end of thelever 63 since the V-shaped member 60 is connected to the intermediateportions of the handle bars which in effect :forms with the shafts 40and 44 a frame. The frame, the chains, andy likewise the sprockets 43and 46 are swingably supported centrally of the main frame.

l. claim 1; A. cultivator comprising a frame, a axle carried bytheframe, traction wheels mounted on the axle, a plurality ot' pairs ofspaced sprockets, chains trained over pairs of the sprockets, spacedangle bars located in a horizontal plane and carrying the sprockets,bars provided with teeth and secured to the chains and transversely ofthe traine, means located centrally of the frame for bodily elevatingthe angle bars and for swingably supporting said bars, chains andsprockets, means operatively connecting the sprockets with the tractionwheels for causingl a braking action on the cha-ins.

2. A cultivator comprising a frame, an axle carried by the trame,traction wheels mounted on the axle, a plurality of pairs of spacedsprockets, chains trained over pairs ot the sprockets, spaced angle barscarrying the sprockets, bars provided with teeth and secured to thechains and transversely of the trame, means for moving the angle bars,chains and sprockets vertically, means operatively connecting thesprockets with the traction wheels for causing a braking action on thechains, thelast-`1nentioneclbars being provided with arms extendinginwardly, rollers on thetrce ends of the arms adapted to ride on theangle bars 'for supporting the chains when the teeth are applied to theground.

A cultiva-tor comprising a frame, an axle carried by the frame, tractionwheels mounted on the axle, a plurality of pairs of spaced sprockets,chains trained over pairs of the sprockets, spaced angle bars carryingthe sprockets, spaced bars provided with teeth and secured to the chainsand transversely of the frame, means located centrally ot the trame forbodily elevating or lowering the angle bars and likewise the chains andsprockets through horizontal planes, and for swingably supporting saidbars, means oper- .a-tively connecting the sprockets with the tractionwheels for causing a braking action onthe chains, and means forrestraining rotation of the sprockets to prevent movement of the chainsvand teeth.

4- A cultivator comprising a frame, an axle Y carried by the frame,traction wheels mounted onthe axle, a plurality of pairs ofspacedsprockets, chains trained over pairs of the sprocket-s, spaced anglebars carrying the sprockets, bars provided with 'teeth and secured tothe chains and transversely of the `trarne, brackets secured to thevangle bars intermediate theends thereof, means located eentraifly ofthe frame for elevating or 10W- 'ering the brackets for moving the anglebars, chains and sprockets through horizontal planes, :means operativelyconnecting the sprockets with the traction wheels for causing a brakingaction on the chains.

5. A eultivator comprising a frame, an axle carried by the frame,traction Wheels mounted on the axle, a plurality lof pairsV of spacedsproeketschains trained over pairs of 'the sprockets, spaced angle barscarrying `Vthe sprockets, bars provided with teeth and secured to thechains and transversely of the '.rame, means for moving the angle bars,

chains and sprockets vertically, means oper atively yeonnectinagf thesprockets with the traction wheels for causing a braking action on thechains, the .last `mentioned bars being provided with arms extendinginwardly, rollers on the free ends of the arms adapted to ride on theangle bars .for supporting the chains when the teeth are applied to theground, and a braking means for retaining the 'chain-s and teeth againstmovement.

6. A eufltivator comprising `a frame, an axle carried by the frame,tractionrwheels mounted on the axle, a plurality` of pairs of .spacedsprockets, Chains trained over 'pairs of the sprockets, spaced anglebars carrying the sprockets, bars provided with teeth and secured to thechains :and transversely of the frame, linea-ns for moving the anglebans,

` Achains and sprockets vertically, means operativelyeonneeting thesprockets with the traeti'on Wheels for causing a brakinlg` action onthe chain-s, the Ylast mentioned bars being provided with arms extendinginwardly, rollers on the free `ends of the arins adapted to ride 'on theangle bars for supporting the lchains when the teeth are applied to theground, manual means for retarding the speed f of movement kof theChains and Ateeth longitudinally oi? the frame. y

'i' A cultivator Comprising a frame, an lax'le carried by the frame,traction Wheels mounted on the axle, a plurality of pairs of spa-cedsprockets, chains trained over pairs of the sprockets, spaced angle barscarrying e,

the sprockets, bars provided with teeth and Vsecured to the Chains andtransversely V0i. the

trame, a bell'crank Ipixvoted on the frame, links mnneeting' the arm ofthe bell oran-k with Tthe spaced angle bars for elevating or loweringbodily the angle bars throughout their lengths and also the chains. andsprockets and for swingably supporting said bars, means eperatvelyconnecting `the sprockets .with thetraetion wheels for `causing :a brak-@ing -`action enjft'he -ehains JOHN M. HJERMsfran..

